Kellogg was born to Ralph Murray Kellogg and Diquita Irwin in Provo, Utah on March 17, 1912, and moved to Southern California as a baby. In 1933, he received a B.A. in political science at UCLA, where he played on the basketball team and served as student body president.

For his first professional job, Kellogg wrote as a special features writer for Hearst newspapers and magazines. He forged personal relationships with William Randolph Hearst in L.A. and San Simeon.

Before his career as a Hollywood agent, Kellogg worked as a personal assistant to Irving G. Thalberg of MGM in the 1930s and subsequently as a film editor for Warner Bros.

His career as a rep started in the 1940s for Berg-Allenberg Agency, which in 1950 merged into the William Morris Agency.

Kellogg is survived by his wife Anna, five children and five grandchildren.